Exam 3: Using Methods, Classes and Objects

What is the difference between a mutator method and an accessor method? Provide an example of each.

Access specifiers are sometimes called access____.

A method header is also called a(n) _____.

Parentheses in a method declaration contain parameters that are "dropped into" the method.

A(n) ____ constructor is one that requires no arguments.

Methods used with object instantiations are called ____ methods.

Any class can contain an unlimited number of methods.

An application's main() method must have a void return type.

Which of the following is NOT an initial value assigned to an object's data field by a default constructor?

Normally, you declare constructors to be ____so that other classes can instantiate objects that belong to the class.

public class Employee {    private int empNum;    private double empSalary; ​    public void setEmpNum(int emp)    {       empNum = emp;    }     public void setEmpSalary(double sal)    {       empSalary = sal;    } } Given the class defined in the code above, write the Java statements that will create a new employee instance called employee15 and assign an empNum of 15 and empSalar y of 500.00 to that employee instance.

What are the four components of a method header?

Methods that retrieve values are called ____ methods.

The name of the ____ is always the same as the name of the class whose objects it constructs.

Every object is a _____ of a more general class.

The ____ method executes first in an application, regardless of where you physically place it within its class.

How do you use a value returned from a method? Provide an example.

Does a programmer need to write every class he or she uses? Why or why not?